I happned to have a gold colored and a green colored EM172.
Connected to a Sony M10, there was 1,45 v over the golden one and 1,35v
over the green one.
As the 0,7v over two "gold" mic's is just on the limit, I would not
recommend connecting two em172 green version.
Klas.
On 2016-09-02 20:49, Telinga [naturerecordists]
wrote:
> It depends on the capsules used and how much current they need, mostly
> between 0,1mA to 0,25mA.
>
> Two EM172 per channel is maximum into a Sony M10 or 50. Actually,
> following Primo specifications, it shouldn't work, but it does. (During
> my 40+ years of working with Primo capsules, I have found that their
> specifications are unreliable at both ends, they can be much better
> than
> the spec's say, or much much poorer.)
>
> A problem here is that if you Google EM172 pictures, you can see
> EM172's
> with different colors at the back, brown, green, red and white. I
> suppose there is a difference between them, but Primo doesn't say
> which.
> Worst case, there are EM172 batches that need more current than Sony
> M10
> / 50 can provide, if you connect them in pairs.
>
> When two capsules are connected in parallell to a Sony, you should
> measure at least 0,75 v.
>
> Two EM172's per channel is safe with all recorders having the standard
> 2,7k input, like the Olympus models.
>
> Klas
>
>
> 2016-09-02 07:34, vickipowys
> [naturerecordists] wrote:
>> Klas at Telinga pointed out that only some recorders can supply enough
>> power for 4 electret capsules. I know that the Olympus LS10 - 11, and
>> Sony M10 will work. Klas has tested many recorders for powering 4
>> electrets, but I don't recall all the results
>>
>> I have compared set ups using 2 electrets, and 4 electrets, to an
>> LS10. 4 electrets gave a 3 db stronger signal.
>>
>> Vicki
>>
>>
>> On 02/09/2016, at 7:55 AM, Dan Dugan
>> [naturerecordists] wrote:
>>
>>> Multiple caps can work like that, the Telinga Clip-On is an example.
>>> I don=92t know how they=92re wired, however.
>>>
>>> -Dan
>>>
>>>> On Sep 1, 2016, at 1:06 PM, [naturerecordists]
>>>> <
>>>> > wrote:
>>>
>>>> II am getting conflicting information regarding the use of multiple
>>>> caps in a mod SASS DIY microphone.
>>>>
>>>> I have read that wiring two electric caps in parallel would produce
>>>> about 3db more noise than a single cap but the signal would
>>>> increase by 6db which would give me a better signal to noise ratio.
>>>> When recording quite nature sounds that should be desirable.
>>>>
>>>> A second source tells me that the mic=92s do not work that way and
>>>> noted that if it did everyone would be building mic=92s like that.
>>>> The only mic=92s that I see on the market use one cap per channel so
>>>> he may be correct.
>>>>
>>>> I would appreciate any feedback from those trained in electronics
>>>> or that have made tests to verify these configurations.
>>>>
>>>> Cross post to Mic builders
>>>>
>>>> Gerald White
>>>
>>
>>
>>
>> ------------------------------------
>>
>> ------------------------------------
>>
>> "While a picture is worth a thousand words, a
>> sound is worth a thousand pictures." R. Murray Schafer via Bernie
>> Krause.
>>
>>
>> ------------------------------------
>>
>> Yahoo Groups Links
>>
>>
>>
>
>
> ------------------------------------
> Posted by: Telinga <>
> ------------------------------------
>
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie
> Krause.
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
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